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Table 1 Kinetic parameters for net-nitrate uptake by roots and leaves

From: Nitrate transport in cucumber leaves is an inducible process involving an increase in plasma membrane H+-ATPase activity and abundance

Parameters*

Roots

Leaves

N-free

+Nitrate for 4 h

N-free

+Nitrate for 12 h

Km (mM)

0.35

0.12

0.79

0.52

Vmax (μmol NO3- g FW-1 h-1)

2.04

11.52

0.48

1.12

  1. *Calculated in the 0.05-0.5 mM concentration range. Values for Km and Vmax were obtained using the Lineweaver-Burk method (double reciprocal method) of data fitted to the Michaelis-Menten equation.
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BMC Plant Biology

ISSN: 1471-2229

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